JPH0644351U - Control device for vehicle generator - Google Patents

Abstract

(57) [Summary] [Purpose] To stabilize the battery voltage and increase the power generation ratio during deceleration rather than during engine power running. [Structure] The capacitor is disconnected (S1), the engine speed is detected (S2), and the engine load factor is calculated (S
3) The operating state of the engine is determined (S4), the battery voltage is compared with the standard value (S5), it is determined whether the capacitor voltage is low or high (S6), and the field current is controlled to increase (S7). ), This field current is output to the field coil to generate power (S8), and after a predetermined time has elapsed (S8).
9) and it is determined whether the engine is stopped (S1
0), the capacitor is disconnected (S11). The capacitor is put into a discharging state (S12), and the field current is controlled to decrease (S13). Compare the battery voltage with the standard value (S
14). It is determined whether the capacitor voltage is low or high (S1
5) The capacitor is charged (S16).

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a control device for a vehicle generator, and more particularly to a technique for improving fuel efficiency of an engine by controlling a power generation rate.

[0002]

[Prior art]

 An automobile is equipped with a generator that supplies electric power to an on-vehicle battery. FIG. 4 shows a conventional power generation circuit. A vehicle-mounted battery 1 is connected to a load 4 via an ammeter 3, and a generator 2 is connected between the vehicle-mounted battery 1 and the load 4. In the generator 2, in order to keep the charging voltage for the field coil 5 and the on-vehicle battery 1 constant, the resistance is increased or decreased to adjust the field current (field current) to the field coil 5 to adjust the output voltage. A voltage regulator (voltage regulator) 6 for controlling, a status coil and a rectifier 7 are provided.

The field coil 5 and the voltage regulator 6 are connected in series between the ammeter 3 and the load 4, and the stator coil and the rectifier 7 are also connected between the ammeter 3 and the load 4. To be done.

[0004]

[Problems to be solved by the device]

 However, in the conventional control structure of the generator, as described above, the voltage regulator 6 adjusts the field current to the field coil 5 to control the output voltage from the generator 2. For this reason, there are cases where power is generated during engine power running where the mechanical energy generated by the engine cannot be effectively used, and conversely when power is not generated during deceleration where mechanical energy generated by the engine can be effectively used. Therefore, the mechanical energy generated by the engine is not effectively used for power generation, which causes deterioration of fuel efficiency of the engine. In particular, in recent years, the number of in-vehicle electrical components has increased, and the generator output has also increased, which has made the fuel consumption worse.

There is also a method of detecting only the load state of the engine to reduce the power generation rate during power running, but this has the disadvantage that the battery voltage fluctuation increases. Conventionally, Japanese Patent Application Laid-Open No. 54-121910 discloses a technique of increasing the generator output by speeding up a generator, and Japanese Utility Model Laid-Open No. 56-174929 discloses a technique in which a current is applied to a field coil of a generator. Techniques for increasing the generator output by flowing a large amount are disclosed respectively.

Further, the present applicant has previously proposed a technique in which the cutoff point is moved to a higher voltage side and the output thereof is increased while keeping the shape of the generator the same (Practical Application No. 4- (See No. 3010). Therefore, the present invention has been made in view of the above, and it is possible to improve the fuel consumption by suppressing the battery voltage fluctuation and keeping the battery voltage stable, while increasing the power generation ratio during deceleration rather than during power running of the engine. To aim.

[0007]

[Means for Solving the Problems]

 Therefore, as shown in FIG. 1, the present invention provides a power generator for supplying electric power to an on-vehicle battery with a capacitor for power energy leveling between the on-vehicle battery and the on-vehicle battery.・ Engine operating state detecting means for detecting the engine operating state, connected via a capacitor control circuit for controlling discharge and disconnection of the capacitor, battery voltage detecting means for detecting the voltage of the on-board battery, and the capacitor voltage The capacitor voltage detecting means for detecting, the field current to the field coil of the generator is controlled based on the detection signals from the engine operating state detecting means, the battery voltage detecting means and the capacitor voltage detecting means, and the capacitor is detected. A control means for controlling the control circuit is provided.

[0008]

[Action]

 In such a configuration, charging / discharging / disconnecting of the generator output and the capacitor is controlled based on the operating state of the engine, the charging state of the capacitor, and the battery voltage, and power generation during deceleration while maintaining the battery voltage stable. By increasing the ratio, fuel efficiency can be improved.

[0009]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 2 is a system diagram of an embodiment of the present invention showing the relationship between the vehicle-mounted battery 10 and the generator 11. The vehicle-mounted battery 10 is connected to a load 13 via an ammeter 12. The generator 11 is connected between the load 13 and the load 13 via a switching regulator 14 described later. The generator 11 includes a field coil 15, a stator coil and a rectifier 16.

Here, a power energy leveling capacitor 18 is provided, and the capacitor 18 controls charging / discharging of the capacitor 18 and disconnection of the capacitor 18 between the vehicle-mounted battery 10 and the vehicle generator 11. It is connected via the control circuit 19. The capacitor control circuit 19 is provided with a charge side contact a connected to the power generation circuit via the diode 20, a discharge side contact b connected to the power generation circuit via the diode 21, and a disconnection side contact c. A changeover switch 22 which is selectively connected to each of the contacts a to c is connected to the capacitor 18.

The switching regulator 14 has a function of keeping the battery voltage stable even if the generator output voltage and the capacitor voltage fluctuate significantly. On the other hand, a rotation speed sensor 23 as a rotation speed detecting means for detecting the engine speed and a load sensor 24 as a load detecting means for detecting the load of the engine are provided, and outputs from these sensors 23, 24 are provided. The detected signal is input to the control unit 25.

The control unit 25 controls the field current to the field coil 15 of the generator 11 based on the rotation speed signal, the load signal, the battery voltage signal and the capacitor voltage signal output from the sensors 23 and 24, respectively. In addition, a control means for controlling the capacitor control circuit 19 is installed by software. In this case, the battery voltage is input to the control unit 25 from between the switching regulator 14 and the ammeter 12. Further, the capacitor voltage is input to the control unit 25 from between the switching switch 22 and the capacitor 18. The field current controlled by the control unit 25 is output to the field coil 15.

The configuration in which the battery voltage is input to the control unit 25 corresponds to the battery voltage detecting means of the present invention, and the configuration in which the capacitor voltage is input to the control unit 25 corresponds to the capacitor voltage detecting means of the present invention. FIG. 3 is a flow chart for explaining the control contents of the control means, and the control contents will be explained based on this flow chart.

In step 1 (abbreviated as S 1 in the figure; the same applies hereinafter), the changeover switch 22 is connected to the disconnecting side contact c to disconnect the capacitor 18. In step 2, the engine speed is detected by the engine speed sensor 23, and in step 3, the load factor is calculated based on the engine load detected by the load sensor 24. In step 4, the operating state of the engine is determined based on the engine speed and the load factor.

When it is determined that the engine is in the idling state or in the power running (when the power is being output), the process proceeds to step 5. In this step 5, the battery voltage is compared with the standard value. If it is determined that the battery voltage is less than the standard value, the load current is large, and thus the process proceeds to step 6. In this step 6, it is judged whether the capacitor voltage is low or high. If the capacitor voltage is low, the process proceeds to step 7, the field current is controlled to a value higher than the standard value, the process proceeds to step 8, and the field coil 15 This field current is output to generate electricity, and the process proceeds to step 9, and after a predetermined time set by the timer built in the control unit 25 has elapsed, the process proceeds to step 10 to determine whether the engine is stopped. To determine. If it is determined that the engine is not stopped, the procedure returns to step 1, and if it is determined that the engine is stopped, the procedure proceeds to step 11, the changeover switch 22 is connected to the disconnecting side contact c, and the capacitor 18 is disconnected. , Control ends.

When it is determined in step 6 that the capacitor voltage is high, the process proceeds to step 12, the changeover switch 22 is connected to the discharge side contact b to bring the capacitor 18 into the discharging state, and the process proceeds to step 13 to determine the field current. Is controlled to a value smaller than the standard value, and the control of steps 8 to 11 is executed in the same manner as above. If it is determined in step 5 that the battery voltage is equal to or higher than the standard value, the load current is small. Therefore, the process proceeds to step 13, and the field current is controlled to a value smaller than the standard value. , Control of steps 8 to 11 is executed.

On the other hand, if it is determined in step 4 that the engine is decelerating (downhill traveling, braking, etc.), the process proceeds to step 14 to compare the battery voltage with the standard value. If it is determined that the battery voltage is less than the standard value, the load current is large, so the process proceeds to step 7, and the field current is controlled to a value higher than the standard value. Execute control.

When it is determined in step 14 that the battery voltage is equal to or higher than the standard value, the load current is small, so the process proceeds to step 15, and it is determined whether the capacitor voltage is low or high, and the capacitor voltage is low. For example, in step 16, the changeover switch 22 is connected to the charging side contact a to bring the capacitor 18 into a charged state, and in step 7, the field current is controlled to a value higher than the standard value, and Similarly, the control of steps 8 to 11 is executed.

If the capacitor voltage is high, the routine proceeds to step 13, where the field current is controlled to a value smaller than the standard value, and the controls of steps 8 to 11 are executed in the same manner as above. As described above, when the engine is idling or running, when the battery voltage is below the standard value and the capacitor voltage is high, the capacitor 18 is discharged to reduce the generator output, and when the capacitor voltage is low, the capacitor is While the generator output is increased with 18 disconnected, when the battery voltage is higher than the standard value, the generator output is reduced with the capacitor 18 disconnected, while the battery voltage is higher than the standard value while the engine is decelerating. When the capacitor voltage is low, the capacitor 18 is charged to increase the generator output, and when the capacitor voltage is high, the generator output is reduced with the capacitor 18 disconnected, and the battery voltage is below the standard value. Occasionally increase the generator output with the capacitor 18 disconnected. From while keeping the stabilization of the battery voltage, it is possible to increase the power generation rate of deceleration using the effective power of mechanical energy generated by the engine to improve the fuel consumption of the engine. In particular, this is more effective when the output of the generator is increasing due to the increase in the number of in-vehicle electric components in recent years.

As described above, the present invention has been described with reference to the specific embodiments, but the present invention is not limited to this, and those skilled in the art can apply the present invention to the present invention. It should be noted that various changes and modifications can be made without departing from the scope of the attached utility model registration request.

[0021]

[Effect of device]

 As described above, the present invention controls charging / discharging and disconnection of the generator output and the capacitor based on the operating state of the engine, the battery voltage, and the charging state of the power energy leveling capacitor. This is a practical effect that can improve the fuel cost while keeping the battery voltage stable.

[Brief description of drawings]

FIG. 1 is a block diagram of a control device for a vehicle generator according to the present invention.

FIG. 2 is a system diagram showing an embodiment of a control device for a vehicle generator according to the present invention.

FIG. 3 is a flowchart illustrating the control contents of the above embodiment.

FIG. 4 Conventional power generation circuit diagram

[Explanation of symbols]

 10 In-vehicle battery 11 Generator 15 Field coil 18 Capacitor 19 Capacitor control circuit 23 Rotation speed sensor 24 Load sensor 25 Control unit

Claims (1)

[Scope of utility model registration request] 1. In a vehicle generator for supplying electric power to an on-vehicle battery, a power energy leveling capacitor controls charging / discharging and disconnection of the capacitor between the on-vehicle battery and the vehicle generator. An engine operating state detecting unit that is connected through a capacitor control circuit to detect an engine operating state, a battery voltage detecting unit that detects a voltage of an on-vehicle battery, a capacitor voltage detecting unit that detects the capacitor voltage, and an engine operating state. And a control means for controlling the field current to the field coil of the generator based on the detection signals from the state detection means, the battery voltage detection means and the capacitor voltage detection means, and for controlling the capacitor control circuit. A control device for a vehicle generator characterized.